Universal multiple-speed grinder



Jan. 30, 1923; 1,443,453

- C. H. BEACH.

UNIVERSAL MULTIPLE SPEED GRINDER.

FILED JAN. 15. 192i.

Patented an, SD, 1923.,

CHESTER In BEACH,

teases 'unrvnasan MULTIPLE-SPEED GRINDER.

Application filed .Tanuary15, 1921. Serial No.j437,562.

To all whom it may concern.

Be it known that I, Crrnsrnn H. Bnaon, a citizen of the United States, residing at Racine, in the county of Racine and State of Wisconsim have invented certain new and useful Improvements in Universal Multiple-Speed Grinders, of which the following is a specification.

My invention relates to improvements in universal Inulti-speed grinders. j p

In using such grinders it is lmportant to take the desired cut at the right speed, as

accurate work depends upon a'proper speed relation between the wheel and the work,

otherwise there is danger of bell-mouth or taper surfaces; The grinder shown herein is equipped with a number of additional pu leys and grinding spindles, to enable the operator to change quickly the ratio of driving and driven pulleys in accordance with the diameter of the grinding wheel to be used for a particular out. With this equipment I the grinders have a speed range of from 3,600 to 50,000 revolutions per mlnute. VVith such a very high speed of rotation of the spindle and grinding wheel it is also important to'avoid vibration, in order to accomplish the very accurate work of which these grinders are capable.

It is one of the objects of the invention to provide a structure wherein the motor is mounted on the supporting base independently ofthe housing for the grindingspindle, thereby insuring a rigid support'for the spindle, unafliectedfiliiy any vibrationv of the high speed electric motor. Other objects of the invention are to effect various detailed improvements in the structuro of my Patent 1,391,039, September 20, 1921.. j v

Thedrewings illustrate one embodiment of the invention.

Figure 1 a side elevation oi the grinder, partly in section;

2 is an endelevation of the grinder with the motor removed,certain parts being shown on the section line 22 indicated in Figlly I i Fig. '3 is a rear elevation of. the parts shown inllig. 2; and i Fig. 4 is an elevation of one of the substitute grind ng spindles.

a driven pulley l0 bye belt--17.

The grinder is, preterably, mounted by clamping it in the tool postof a lathcor 'EES PATENT OFFICE; or RACINE, WISCONSIN, assrenon rowisoonsrn memo COMPANY, A corarosarrou or isconsin.

other machine tool, and for this purpose is provided with a shank 1, pivoted to a plate 2, the latter being secured by studs tothe base 4, the studs passin throughelongated openings insaid plate, permittingh certain relative adjustment of the parts, in the same manner as in my prior application. The base is recessed and supports a screw-threaded spindle 5, the projecting end of which is adapted to be engaged by a handle, not

shown, to permit it to be rotated conveniently, thereby sliding the motor-supporting block 6 back and forth on the base plate hthese partshaving a dovetailed con 1 nection with each other, as shown more particularly in'Fig. 2. i i a i The block 6 has a pair of circular extensions 7 at its opposite ends, which extensions receive a sleeve 8, the latter having a sliding fit therein. Said sleeve is encircled by a ring 9, having a tight fit thereon, so as to turn with it, said ring fitting between the two rings 7 and having an outer cylindrical surface of thesame diameter as the ring 7, thus presenting a smooth, uniform appear ance. he ring 9 has an extension '10, which supports a short rod 11, the latter constituting a pivotal support for a pair of ears 12 comprising part of a motor-e111porting bracket or cradle 13, whereby the motor 14, secured in said cradle, may be adjusted about the pivoted rod 11. The motor has a removable driving pulley 15 provided on the end. of its armature shaft and ronuected with The belt tension is regulated by a stare\v -tlz'rearled spindle l0 carrying a knurled nut 1 as shown in l ig. 2, l 4 i The driven pulley d6 is removahl mount ed on the end of a shaft .20, mounted in ball bearings (not shown) in opposite en s of cylindrical supports 21 termed integrally with'a second base plate 22, andspaced from each other to receive between them the motonsupportingblock 6 and its integral el tension. The base'plate 22 is mounted on the base independently of the motor support, 0

and has an independent dovetailed connec- 'tion therewith, as shown in Fig.2, sliding onv When the threaded shaft the outer guideivays, While the motor support slides on. the inner guidevi' shown in said figure. Said base plate has central open ing through which the motor-supporting bloclrfi passes, and is moved be. a v

5 is turned, the circular extensions 7 bearing against the adj acentcircular extensions 21 to move them in one direction or the other.

The outer end ofthe'shaft QOcar'ries a grinding Wheel 23, WlllCll may be of any diameter adapted to the "Work to be pe'r-' formed. The Wheel shown in 1 is of maxn'num slze, whlch in practlce, With this particular equipment, would bex about five inches. "This Wheel may be readily re- :placed, however-{by any one of number of smaller wheels, ranging, for example, from a diameter of threesmteenths of an inch.

For internal grinding the wheels are mounted on an extensio'n spindle 2%, such.

as shown, for example, in Fig, 4-, said spin d'le being one of a number of spindles of differentlength-Which may'be screwed into the end ofthe shaft 20. Not only may-the driving pulleys 15-and l6 bra-reversed, so

as t-o'give a higher speed of-rotation for a smaller-grinding Wheel, but any one of a number of different sets of pulleys may be substittrtedto give the'des-ired surfacespeed to the particular grinding Wheel'bein-g used, thereby providing a very Wide rangeoi' speed for the'spindles 20. :The motorand its immediate support, being mounted directly on the base, independently of the mounting for the spindle,--are rigidly -supported, and the grinding spindle also being directly mounted on. a rigid support is not aiiected by any slight vibration. of the motor. The grinder, therefore, is adapted for very accurate work, and furthermoredhe motor may be swung to any one of a number -ol'*'ditl7erent positions about the spindle as u.

center-and locked'in "such position by the sprlngplunger 25, thereby avoiding interference between the motor and the Work,

and permitting the grinding of coi'uparatively inaccessible surfaces The invention is-not lii ted to the structural details shown herein. but may be em lidably mounted v g epindle moi 3 directly on said 'LiOll i base, slidable thereon, and' belted to said motor, said spindle being located between said motor and saidbasc.

2. An electricgrindercomprising a" base,

a. motors'l idably mounted thereon, and a grinding SPlIlCllQ also slidably mounted on said base'and belted tosaidmotor, saidmotor heing mounted to swing about the axis -'o1": 'sa-iclspindle. I

23. electmcgrmder comprising a $112156,

an d forth n. th said base and havii a motor slidably mountedthereon, a grind ing spindle directly mounted on said base between it and the motor, slidable on said base and belted to said motor, and a. threaded shaft carried by said base for adjusting said motor.

4. An electric grinder comprising a base, having two guideivays thereon, a motor, a support i'o'r the motor'slidably mounted on one, guideway, a. grinding spindle beteen .saidmotor and'base, a support for said spindle also slidably'mounted on the other guidexvay and means permitting said motor to drive said spindle.

5. An electric grinder comprising .a base, a motor, a support for the motorshdably .moun-tedson saidbase, a-grindi-ng spindle. a

support therefor also slidably mounted -.on said base, means permitting said motor to drive said spindle,- and means for adjusting said motor on said base, said motor support engaging said spindle supp-ort'to move it When-said motor is moved. i

6. An electric-grinder comprising a base,

a threaded' shaft thereon, a motor support- ;ing block having dove-tailed "engagement WVltlI-StLlCl lease-- and having threaded engagement with said shaft, said block having a pair of .alined rings thereon, a sleeve fitted Within said rings and a-motor cradle revolubly mounted on said sleeve; a .motormounted in said cradle and a grinding spindle driven from said motor.

7. An electric grinder comprising a base, a threaded shaft thereon, a motor supporting block 7 having dove-tailed engagement with said base and having. threaded engagement with said shaft, saidblock having a pair of alined rings thereon, a sleeve fitted within said rings,a motor cradle revolubly mounted on said'sleeve, a motor mounted in said cradle, and a grinding spindledriven from said. motor, and a loclrassociated with said cradle for engaging saidsleeve :to lock the 'motorin diilerent rotative positions.

An electric grinder comprising ,a base, a threaded. shaft thereon, motor support- 9; block having a dovetailed engagement withsaid slaft. said block having ned ring-s thereon, asleeve fitted rings, motor cradle revolubly dsleev a motor mounted in withins mounted on sa-i a *said eradle, a slidably mounted on said base, a

grinding spindle mounted therein and ..;.passing through said sleeve and 'a belt connecting said motor and spindle.

9. .r-rn electrie inder eomprisingabase, spinvflle suppoitqzhaving dove -tailed 'en gagement therewith, said support having a central o sening therethrough, a: motor {support received Within said opening and rest-' 'ingonsaid base-independently of said-spindle support, a motorion said motor-support,"

threaded engage spindle support also a spindle on said spindle support and drivently of said motor and having a removable ing means connecting said motor and spin-v pulley and a driving belt, whereby said pul- 1O dle. leys may be changed to vary the speed of 10. A high speed electric grinder comprissaid spindle and whereby said spindle is uning a base, a motor adjustably mounted afi'eeted by an vibration of said motor. thereonand havingan armature shaft with In testimony whereof, I have subscribed a removable pulley, a grinding spindle also my name.

adjustably mounted on said base independ- CHESTER H. BEACH. 

